Gun for blowing asphalt and the like



Nov. 2%, 1929. c. D. BOYNTON GUN FOR BLOWING ASPHALT AND THE LIKE FiledJuly 3, 192

7 N y 7 1 l N My ATTORNEY UNITED STATES PATENT OFFICE CABLE D. BOYNTON,OF JOPLIN, MISSOURI GUN FOR BLOWING ASPHALT AND THE LIKE Applicationfiled July 3, 1926. Serial No. 120,286.

The invention relates to devices for blow- Fig. 2 is a transversesection taken on the mg by means of air, liquid substances as, for lme22 of Fig. 1; and instance, asphalt or other material suspend- Fig. 3 isan end view looking into the front ed in a liquid, for the purpose ofcoating a end of the nozzle.

desired surface with such substances, or for In the followingdescription and in the 55 any other purpose. These devices are genclaimsparts will be identified by specific erally known as air guns. names forconvenience, but they are intended According to the invention an air gunmay to be as generic in their application to simibe provided which maycomprise a barrel of lar parts as the art will permit.

suitable length having at its front end a Referring now to the drawing,the air gun 0 nozzle member. The nozzle member may be may comprise abarrel 1 of suitable length provided with a recess having a seat for awhich may be made up of a longitudinal pipe needle valve and a nozzlecavity connecting m m er 2 h v ng a T-fi ting 3 at its rear with saidrecess. An air chamber may sur end Into the lower opening of theT-fitting round the recess and cavity, the air chama handle member 4 maybe provided, the her having by-pass holes extendin to the handle memberbeing in the form of a pipe needle valve recess and multiple holesextendand communicating with the interior of the ingto the nozzle cavitSuitable connecting barrel. Threaded into the rear end of the devicesmay be provi ed for feeding the subng 3 may be a fiing b X 5 haVlIlg an20 stance to be blown from the gun into the baropening thZOHgll whichthe spindle 6 Of the rel, and additional devices may be provided needlevalve 7 may pass, the stufling box 5 for supplying the air chamber withair under being provided with a gland member 8 and suitable pressure.packing 9 for efiectively sealing the spindle The provision of th by-pashol llow against the escape of the liquid material.

25 the air to be. mixed with the liquid material Pivo ed 0 the h n lemember 4 may be a before it enters the nozzle, thereby agitating valvelever 10 having a lower hand engaging the liquid material at this pointand insuring portion 12, and an upper portion 13 provided proper andcontinuous action. The proviwith a hole through which the spindle 6 maysion of the multiple holes leading to the nozpass loosely- L Ck nu s 14may be provided so zle cavity tears the material stream up and 011 the pn On either Side Of the pp r blows the particles effectively onto thesurportion. A. leaf spring member 15 may be face to be coated. Both themultiple holes RrOVlded w n h hand engaging porand by-pass holes may ber d so as t tion 12 and the handle member to normally g; up a i li ti thli id t urge the needle valve 7 against its seat.

:55 i l At the forward end of the barrel 1 a nozzle 45 claimed.

Various other objects and advantages of member 16 may be Rrovlded- Thenozzle the invention will be obvious from the folmember CODEIPIISQreduced threaded lowing particular description of one form of fi g 1 i ybe thregded Into device embodying the invention or from an t {if 3 i 1P85 0 inspection of the accompanying drawings; a ff er d S? e 9 and theinvention also consists in certain new 0 n O E e Orwar en 0 e plpe memer and novel features of construction and combi- 2 to act as a gulde forthe needle Valve The nozzle member 16 may be provided at natlons ofParts heremafier set forth and its rear end with a recess 19 having aconical seat 20 for seating the needle valve 7 and at Referrmg W to ther g Wh10h a its front end a conical nozzle cavity 22, there singlemodificatlon of the inventlon 1s shown b i an ni g on cti g id recess dfor purpose of illustration only: cavit The nozzle member may further beFig. 1 1s a longltudmal elevation partly in provided with an annular airchamber 23 0 section of the air gun; surrounding the opening, theannular air chamber having connecting therewith a plurality of by-passholes 24, the by-pass holes intersecting the recess 19 substantiallymidway the length thereof and tangentially for a purpose hereinafterdescribed more in detail. These by-pass holes 24 may be formed bydrilling holes from the outside of the nozzle member 16, these holescrossing the annular air chamber 23 and intersecting the recess 19substantially tangentially thereof. The part of the holes between theair chamber 23 and the outside of the nozzle member may be plugged up bythe plugs 33. Similarly, a plurality of multiple holes 25 may beprovided connecting with the air chamber 23 and intersecting the nozzlecavity 22 substantially midway its length and tangentially for a purposehereinafter described.

The nozzle member may be provided with 3. depending tube 26 connectinwith the air chamber to which may be suita ly secured an air pipe 27which may extend along the barrel and handle, being secured thereto bymeans of straps 28. An air valve 29 may be provided in the, air line forcontrolling the air flow. The lower ends of the handle member 4 and airpipe 27 may be provided with suitable connecting devices such as screwthreads 31 and 32 for connecting feed pipes (not shown) leading tosuitable tanks (not shown) containing the liquid material and air respectively.

The provision of the air chamber and bypass holes allows air to be mixedwith the liquid substance before it enters the nozzle. The air beinunder a higher pressure than the liquid su stance will agitate theliquid substance and the tangential location of the bypass holes 24 willgive it a swirling motion, thereby insuring proper and continuousoperation of the gun. Also the tangential multi le holes 25 extendingfrom the air chain er 23 to the nozzle cavity 22 cause the mixture ofthe air and liquid material to be torn and broken up and the particlesto be effectively spread out.

In operation the pressure on the liquid substance in the tank may befrom 15 to 30 pounds depending upon the lift, the material and thedistance between the gun and the tank. The air pressure may be from to100 pounds to give proper operation. The by-pass holes 2 1 aresufficiently small so that the relatively higher air pressure does notcause a back pressure to be built up against the entering liquidsubstance which will interfere with the proper operation. If desired,instead of having the auxiliary valve on the air line a valve may beprovided which will control both the air and the flow of the liquidsubstance simultaneously. A valve on the air line is preferable,however, because at times it is desirable to blow the liquid materialstraight through without the use of air at the nozzle. It is obviousthat the nozzle member is detachable and may be replaced by nozzles ofdifferent dimensions, if desirable, for different purposes.

Thus it will be seen that an air gun is provided which is simple inconstruction, inexpensive to manufacture, and eflicient in operation.The liquid material is mixed with the air by by-passing part of the airbefore it is fed to the nozzle cavity. This by-passing of the aireffectively agitates and mixes with the liquid material before it entersthe nozzle, thereby insuring proper and continuous operation. Theprovision of the tangential multiple holes causes the liquid substanceto be broken up into particles and to be properly spread throughout thedesired area.

While I have shown and described and have pointed out in the annexedclaims certain novel features of the invention, it will be understoodthat various omissions, substitutions and changes in the forms anddetails of the device illustrated and in its operation may be made bythose skilled in the art without departing from the spirit of theinvention.

Having thus described my invention, 1 claim:

1. An article of the class described comprising a hollow barrel adaptedto have supplied thereto a fluid substances it is desiredto discharge, anozzle member connected to said barrel at the front end thereof, saidnozzle member having a nozzle opening, said nozzle member also having anauxiliary fluid chamber, an auxiliary fluid conduit communicating withsaid chamber, a by-pass hole connecting with said chamber and the backend of said opening, a second hole connecting with said chamber and thefront end of said opening, and a valve for simultaneously blocking saidnozzle opening and one of said holes.

2. An article of the class described comprising a hollow barrel adaptedto have supplied thereto a fluid substance it is desired to discharge, anozzle member connected to said barrel, said nozzle member having acavity in its front, a recess with a seat in its back end and an openingconnecting said recess and cavity, said nozzle member also having anauxiliary chamber, an auxiliary conduit communicating with said chamber,a by-pass hole connecting with said chamber and said recess, a multiplehole connecting with said chamber and said cavity, a needle valve toseat in said seat, and means for controlling the position of said valve,said valve being adapted to simultaneously block said opening andby-pass hole. 2

3. An air gun comprising a hollow barrel having at the rear end thereofa handle and adapted to have supplied thereto a fluid substance it isdesired to discharge, a nozzle member connected to said barrel at thefront end thereof, said nozzle member having a conical cavity in itsfront, a recess with a conical seat in its back end and an openingconnecting said recess and cavity, said nozzle member also having anannular chamber surrounding said opening, an air pipe com municat-ingwith said chamber and an air valve, a plurality of by-pass holesconnecting with said chamber and intersecting said recess tangentially,a plurality of multiple holes connecting with said chamber andintersecting said cavity tangentially thereof, a needle valve having aconical portion to seat in said seat and a spindle extendin through therear end of said barrel, and a oted to said handle and spindle.

4. An air gun comprising a hollow barrel having at the rear end thereofa hollow handle communicating therewith, said hollow handlebeing adaptedto have supplied thereto a. fluid substance it is desired to discharge,

a nozzle member having threaded connection with said barrel at the frontend thereof, said nozzle member having a conical cavity in its front, arecess with a conical seat in its back end and an opening connectingsaid recess and cavity, said nozzle member also having an annular airchamber surrounding said opening, an air pipe communicating with saidchamber and an air valve at said handle, a plurality of by-pass holesconnecting with said chamber and intersecting said recess tangentiallymidway the length of said seat, a plurality of multiple holes connectingwith said chamber and intersecting said cavity tangentially thereofmidway its length, a needle valve having a conical portion to seat insaid seat and a spindle extending through the rear end of said barrel,and a lever pivotally connected to said handle and spindle.

5. A coating gun comprising a nozzle member having a restricted nozzleopening with a front enlarged cavitv and a back enlarged cavity, asource of fluid coating sub-v stance connected to said back cavity, asource of auxiliary carrier fluid connected to said front cavity byfirst passages and to said back cavity by small second passages so thatno appreciable back pressure can be built up against said coatingsubstance, said first and second passages being arranged to impart awhirling motion to said coatin substance.

In testimony whereof I have ereunto set my hand.

CABLE D. BOYNTON.

lever piv-

